Tree 15-40 m. Twigs 4-11 mm diameter, pale whitish brown or grey-brown, contrasting with the brown-black colour of the dried petioles, early glabrescent, at first with grey-brown hairs 0.1-0.2 mm; bark rather smooth or coarsely striate, sometimes with a tendency to flake; lenticels conspicuous only towards the apex. Leaves crowded towards the apex or not, in 3-5 rows, thickly membranous to chartaceous, oblong(-lanceolate), (10-) 18-24 by 3.5-7 cm, base long-attenuate, apex acute-acuminate; upper surface drying (dark) brown, lower surface drying bright brown, glabrous (early glabrescent); dots absent; midrib flat or slightly raised above, glabrous; nerves 12-16 pairs, ± flat above, lines of interarching not distinct; venation lax, hardly visible above; petiole 12-34 by 1.5-3 mm; leaf bud relatively short and broad, 8-12 by 3-5 mm, with dense hairs 0.1-0.2 mm long. Inflorescences behind the leaves, subglabrous or glabrescent, with weak hairs 0.1-0.2 mm; in male: 2 or 3 times branched, many-flowered, 6-12 by 4-6 cm, peduncle (0.2-)0.5-1.5 cm long, the flowers in clusters of 4-10; in female (from in-fructescences): few-flowered, 1.5-3 cm long; bracts minute, very early caducous; flowers glabrous, perianth 3-or 4-(or 5-)lobed, pedicel not or incidentally articulated. Male flowers: pedicel slender, 2-4 mm long; buds (slightly depressed-)globose, 1.5-2 by 2-2.5 mm, cleft 1/3-1/2, not or but slightly collapsing on drying; lobes 0.1-0.2 mm thick, androecium (depressed-)globose, 0.8-1 by 1-1.2 mm (Plate 2: 44)\ thecae 14-18, almost completely sessile, incurved at the apex; column broad and solid without or with minute apical cavity (this rarely in S Thailand); androphore ± slender, 0.3-0.4 mm long. Female flowers (from young fruits): 3 mm long, 3-or 4-lobed; ovary glabrous. Fruits 2-4 per infructescence, ovoid-ellipsoid, 3-5.5 by 2.5-4.5 cm, glabrous, drying blackish, finely granulate, sometimes ± tuberculate; pericarp 4-20 mm thick; fruiting pedicel 5-7 mm long; perianth not persistent.
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